Swinging frame band-sawing machine



June 12, 1951 J. L.*ASHWORTH SWINGING FRAME BAND-SAWING MACHINE 2 Sheets-Sheet 1 Filed May 15, 1947 J1me 1951 J. ASHWORTH 2,556,670

SWINGING FRAME BAND-SAWING MACHINE Filed May 15, 1947 '2 Sheets-Sheet 2 l 31 8 2521 E 25 g 15 -"Qz 14 G. H I14 35 Patented June 12, 1 951 UNITED STATES OFFICE SWINGING FRAME BAND-.SAW'ING MACHINE Joseph L. Ashworth, Worcester, Mass.

Application May 15, 1947, Serial No. 748,241

3 Claims,- 1

This invention relates to w n ma hines and more particularly to that type of sawing machine which employs a powe -driven dl s saweband.

It is a primary ob ect of the re entihve eh to provide a sawing machine of the type having a w r -hol in m ans. and a con i uous y rotati-ng saw-band with means whereby 3 9 56 W 9 lat" ter elements may be, adjusted r lati e t t eth other so that the Work or stock may be cut at various predetermined angles.

Another primary object of the present invention is to provide a sawin machine havin a power-driven endless saw-band with a pivoted saw-carrying frame which is designed in a manner such that it will afford a maximum amount of unobstructed working space about the area of the work.

A further object of the present invention is to provide a machine of the above described type which is adapted to operate in a highly eflieient manner but which at the same time is so designed that it may be inexpensively manufactured.

With the above and other objects Vii-2W, as Will. hereinafte appea the inventio c mp ises the devi es, combinat ons and ar n ment of pa ts des ribed in connection wi h t e eeeem namin drawin s which illust a e a pre erred embodiment of the nven on i Whj h Fi 1 repres s a p speeti e vieweie rh hine n hic the prese t h eh eh s nte pc ated.

Fi 2, re e ents, en ar e ca a i h ha d end view o th m ch ne u t e in Fi l- F g. 3. represents, o scal sim la t9 t at used in Fi 1, ato pla view, part i s c ion of t pr sen ma h e tak n ubstant lly a n line 33 o He b t ith t ar 34 r tate h u h an a le A .Fie. is represent on a scale simi a to tha u ed in g. 1, a iew f the s -hand ca yi g frame as viewed along the line (174 of Fig. 2.

Big. '5 represents, on an enlarged scale, a vertical sectional View of the present machine talgen substant a l a ng line of F re Refer in pa t ul rl to Fi sand .5 o the drawings, the present sawing machine comprises a main support base which includes a hollow column or pedestal 10 supported in a vertical Pesitien b mean o a pl ral t o .hQ i-Zo all disposed e t H, H which a ew ld 9. wis -su ta ly secu ed, as a e he e l-i W d d e the w red it t p po t on-o t e. or

werk o dih iaw 15, hole 11; I! a e adap ee to secure the stat onary .ia-W it d rect 1119911 the surface 1 of the anvil This .i L is provided w h thehsi ai ype 9i ver eal y .d posed WQrk-eh aaih s rfme J and 9, in wi h. th ja 15 i rameicah ei w 3 w o. also ,sii hort dupeh the su ace lie t e anvil M The anvil ise-lse revided withelch W1 1i" nally disposed slot 20 formedin e snriace 15 thereof rs dahl ghe hted w thin thi slot is a ton ue port on, 21 hie. that 2.? Whieh disposed benea h t e shriate 1.5 o the ehvilmem r. t he ervmere elts 23 23 are ada t d ier 59?}!!- in the movable 19 t9 .the' leeh .2? in a a hion shah t at the Jew @IAQ ,bleek may be hif ed ate .l he tu ahr hi t e slet Zihehdehdei theahvi member it seemsit) .is a hol ow tube 2,4 in h c is uitebi r tatahlv mounted a sha 25 51 int :th V. A) r h rt eh of h hat 3 has e hee ith siv deq t ere n s the ah on er ay d ust th a i t er 16 b m rel u n he a e qehwi e e a P uritt rle means, net t e with the shaft ovemen o the Same te eleehwise 91 er in vdi elesesi, asse s to re tin th .e s within the tube 24 th above itis to be LlQ emt QQ thhl fit b rea aced upon the .mhip rt h of, ,hPr-izoht j di p se anvil hr ee l the therea er th m vab J t may be shifted toward the stationary jaw 16 to the end h the WW w l he .su te hi dam in apropgrlposmgn .Still reierrihe 120.3 13 @1 95, ther i r jecting frornthe for ard portion of the anvil I a guide cvlirid hrfi 1.1 1113 SJiQfiD Y ifi iv Wi h a hplletv ollar :23 ,S iteh v e u then the .ier ers hertieh 9f anvi ihe h ht This cylinder 2;! n ay be fted baclg and forth w t the tel er t h -therhwr ma e locked in any desired posi on by merely tightenin; se c w 2, w h is thre d rad al within the collar 28. ably mounted upon the d sta ehdef the y ider 21,-heeee ni 3 po Whe r vete hehhtede et re a assayed 3|. A set screw 32 is threaded radially within the collar 36 for clamping the latter in any desired position longitudinally of the cylinder 21. From the above it is to be understood that the bar 3| may be used as a work-gauge to the end that the work may be properly positioned initially between the jaws l6 and I9.

Referring now to Fig. 5, the upper portion of the column member I is reduced in diameter as at 33 and is adapted to receive thereabout a hollow sleeve portion 34 of a pivoted arm 34 which extends horizontally, as shown in Fig. 3. The lower portion of the sleeve 34 rests upon a plurality of bearing balls 35, 35 which are disposed circumferentially about a shoulder 36 formed at the junction between the reduced portion of the column 10 and the lower or main section thereof. An annular ball-retaining gib 31 is suitably positioned about the column I6 so as to retain the balls 35, 35 in position. From the above it is to be understood that the pivoted arm 34 is mounted in a fashion such that it may.

be freely rotated about the column In upon the anti-friction balls 35, 35. Referring particularly to Fig. 1, the sleeve 34' is provided with a longitudinal slot 38 which permits the sleeve to be clamped tightly about the column It] for the purpose of locking the sleeve in any desired position of angular adjustment. For the purpose of so locking this sleeve the latter element is provided with a pair of projecting bosses 39 and 40 of which the latter is threaded to receive a clamping screw 4!. A portion of the screw passes freely through the boss 39 and bears against the same so that the screw may, in the usual manner, function to tighten the sleeve 34' about the column In.

As may be best seen in Figs. 1, 2 and 3, the pivot arm 34 extends outwardly from the column I0 to form a mounting upon which a saw-band frame may be pivotally mounted. More specifically, there is pivotally mounted within the extreme end portion of the arm 34 a rock shaft 42 the opposite end portions of which extend beyond the confines of bearing bosses 43 and 44 provided upon the opposite sides of the arm 34. Supported directly upon the opposite end portions of the rock shaft 42 are a pair of vertically disposed side members 45 and 46 which, at their upper portions, have connected thereto a sawcarrying frame 41. Suitable nuts 48 and 49 are each threaded over a respective end portion of the rock shaft 42 for the purpose of clamping the side members 45 and 46 in a proper position. From the above it is to be understood that the frame member 4'! is supported entirely upon the rock shaft 42 and, furthermore, through the medium of this rock shaft, the frame 4'! with its component parts, is adapted to be rocked relative to the stationary support base and in a vertical plane.

Disposed about one end portion of the rock shaft 42, at a point between the bearing boss 43 and the side frame element 45, is a torsion spring 50 one end portion of which is secured to the side frame member 45 while the other end portion 52 thereof is secured to a head member 53 which in turn is pivotally mounted upon the top portion of a hand screw 54. This hand screw 54 is threaded within a bracket 55 provided upon the pivot arm 34. Thus, by adjusting the hand screw 54 in a vertical direction one may alter the effective force of the torsion spring 50 to the end that the frame unit 41 may be properly counterbalanced about the rock shaft 42. A

chain 56 is provided on the present machine for preventing the frame 4! from swinging in an upward direction beyond a safe predetermined angle. As may be best seen in Fig. l, the upper portion of this chain 56 is secured directly to a portion of the frame 41, while the lower portion of the chain is secured directly to the upper surface of the pivot arm 34. In order to prevent the frame 41 from swinging downwardly toward the anvil member beyond a predetermined point, there is provided a stop in the form of a bar 51 which is secured between the two side members 45 and 46. As may be best understood by referring to Figs. 1 and 2, this bar 51 is provided with a pair of adjustable stop screws 58, 53 which are threaded through the bar so as to engage the upper surface of the arm 34 and thereby prevent the frame from moving downwardly beyond a predetermined angle.

The above noted saw-carrying frame 41 comprises a pair of laterally spaced and parallel platform members 59 and 66, which have their upper surfaces disposed in a common plane which in turn is disposed normally at a 45 angle with the horizontal. The platform members 59 and 60 are joined together at their rear and normally elevated edge portions by means of a bridge-piece 6i and at their forward and normally depressed edge portions by means of an inverted U-shaped yoke arm or guide 62. Thus, the platforms 59 and 60 normally straddle both jaw members [6 and IS in a fashion such that a maximum amount of clear work area is provided thereabout.

Referring particularly to Figs. 2 and 3, the upper portion of the side frame member 46 extends upwardly beyond the confines of the platform member 60 thereby to form a lip member 63. An electric motor, generally designated by the numeral 64, is carried upon a base member 65 the lower portion of which is adapted to be pivotally secured upon the back side of the side frame member 46 as at 66. The upper portion of this base 65 is biased away from the side frame 46 by means of a coil spring 61 surrounding a bolt 68 which passes through both the side frame member 46 and the platform 65. A nut 69 holds the bolt in place and prevents the platform 65 from shifting away from member 46 beyond a predetermined angle.

The motor 64 is provided with the usual rotary shaft 10 upon which is mounted a grooved A V-belt 12 is trained over the pulley that the pivotal mounting 66 functions to permit the motor 64 to pivot thereabout for the purpose of maintaining the belt 12 at a proper tension at all times.

Mounted upon the cross shaft 16 is a saw-band wheel 18 which is disposed in a plane parallel to the platform member 66 and which is adapted to receive and power an endless saw-band 19 which is also trained over a second wheel 80.

Referring particularly to Fig. 4, the wheel is rotatably mounted upon a block 8| which is en-' Also suitably mounted within the From the above itgaged by an :adjus,ting:screW -82I ...E;uitable means, not herein shown, are lprovide'dafor guiding the block 8| so that as theadjusting screw :82 Lis rotated aboutitslongitudinal axis the .block .8] Land the wheel 80 will move toward and away from the saw wheel '58 to the e-ndzthatthe saw :79 will be maintained at a proper tension. The screw 82 is suitably journaled within a block 83 mounted upon the platform member .59., and a handle member 84 is secureduponone end of the screw for the purpose of providing means lwherebylan operator may adjust the secondsaw wheel 80 'in a manner. a-s hereinabove @described. A cover plate ,85 is adapted to be removably secured over the adjusting block 8| by means of a plurality of screws 86,86 which are threaded directlyintothe plat-formmemberSQ. Thus, fromthe above, it'is to be understood that the motor'fi l is adapted to drive the shaft 14 which in turn, through the medium of the reduction gears Ti and 18, functions to rotate the sawrbandil'flfiiliin a continuous direction past the work held .between the jaws lfiand 1'9.

jReferring particularly to Figs. .1 and .2, .it is to be understood that the guide yoke 62 is disposed in a vertical plane and it is provided with a pair of depending guide arms 81 and 88 the upper portion of each of which is formed as an open jaw unit which is adapted partially to encircle the horizontal portion of the yoke 62. Also, each of the jaw portions of the arms 81 and 88 is provided with a hand screw 90 which functions to clamp the arm in any desired position longitudinally of the yoke 62. The lower portion of each of the arms 8? and 88 is formed as a guide for the purpose of receiving the working portion of the saw band 19. It is the function of each of these guides 9| and 92 to deflect the working portion of the saw band from its normal path so that it will be disposed in a vertical plane. From this it is to be understood that the guides 81 and 88 may be adjusted back and forth relative to each other, depending upon the width of the work to be sawed, so that the working portion of the saw band will be held in a vertical plane thereby effectively to operate upon the work or stock. It should be obvious that the distance between the guides 81 and 88 should be reduced in the event that work of small width is to be sawed for the reason that it is always desirable to keep the length of the working portion of saw-band at a minimum.

As hereinabove described, the frame member 41 carries the entire saw-operating mechanism in a unitary manner and this entire unit is pivotally carried upon the rock shaft 42 so that the arm 34 will be effective to adjust the entire frame and saw band operating mechanism about the vertical axis of the column l0 whenever the arm is suitably rotated upon its bearing means. From this it is to be understood that the saw will be effective to sever the work at any desired angle relative to the longitudinal axis thereof. In other Words, once the work is clamped between the jaws l6 and IS, the frame unit ll may be properly adjusted relative to these jaws and about the longitudinal axis of the column ll! so as to sever the work at any desired angle. Prior to inserting work between the jaws l6 and [9 the frame unit 41 is swung upwardly thereby to give the operator proper clearance, and thereafter the frame is swung towards the work and the Weight of the frame is sufficient to enable the saw to cut the work in a proper manner. However, as hereinabove described, the effective downward force of therframefl may be'varied by'means of the hand screw .54 which functions to increase or decrease the force of the torsion spring 50. From this it should be understood that the novel design of the frame unit 41,, with its spaced-apart platform members 59 and til, affords a maximum amount of unobstructed working space about the workclamping jaws l6 and I9, and the fact that the motor .64 ismounted upon the frame -41 makes :for aamachine which is most compact and free from any protruding and ungainly power-connecting elements between the frame and base.

I claim:

1. A sawing machine comprising, a vertically disposed base column, a substantially horizontally disposed work-.supportcarried upon thetop portion .of said column, a sleeve rotatably mounted in surrounding relation about said column just beneath said work-support, an .arm carried by and projecting radially .from said sleeve, a frame unit pivotally mounted about a horizontal axis and upon the free .end portion of said arm so as to be movable toward and away from said work-support, said ,frame includinga pair of parallel and substantially laterally spaced saw-carrying platforms normally disposed so as to straddle said work-holding means and having the planes defined thereby inclined relative to the horizontal, a bridge member securing the normally elevated rear edge portions of said platforms together, a substantially inverted U-shaped yoke member disposed in a vertical plane and having the spaced-apart lower leg portions thereof securing the normally depressed forward edge portions of said platforms together, an endless saw-band rotatably supported by each of said platforms with the plane defined by said saw-band being disposed in parallel relation with said two platforms, a pair of guide arms adjustably mounted upon and depending downwardly from the top portion of said yoke for guiding the working portion of said saw-band in a vertical plane at all times, and an electric motor carried upon said frame for driving said saw-band.

2. A sawing machine comprising, a vertically disposed base column, a substantially horizontally disposed work-support carried upon the top portion of said column, a sleeve rotatably mounted in surrounding relation about said column just beneath said work-support, an arm carried by and projecting radially from said sleeve, a frame unit including a pair of parallel and substantially laterally spaced saw-carrying platforms normally disposed so as to straddle said W0rk-ho1ding means and having the planes defined thereby inclined relative to the horizontal, a bridge member securing the normally elevated rear edge portions of said platforms together, a pair of flat vertically disposed parallel frame-support members pivotally mounted at their lower ends about a horizontal shaft carried by the free end of said arm, the upper end portions of said two frame-support members each being rigidly secured to a respective one of the upper and lower sides of one of said platforms thereby pivotally to support said frame upon said arm, an endless saw-band rotatably supported by each of said platforms with the plane defined by said saw-band being disposed in parallel relation with said two platforms, a substantially inverted U-shaped yoke member disposed in a vertical plane and having the spaced-apart lower leg portions thereof securing the normally depressed forward edge portions of said platforms together, a pair of guide arms adjustably mounted upon and depending downwardly from the top portion of said yoke for guiding the working portion of said saw-band in a vertical plane at all times, and an electric motor mounted upon that framesupport member which is secured to the upper side of one of said platforms, said motor being connected with said saw-band for driving the same.

3. A sawing machine comprising, a vertically disposed base column, a horizontally disposed work-support mounted upon the top of said column, a sleeve rotatably mounted on said column beneath said work-support, an arm carried by and extending radially from said sleeve, a saw frame pivotally mounted about a horizontal axis upon the free end of said arm, so as to be movable toward and away from said work-support, said frame including a pair of parallel, laterally spaced platforms normally disposed so as to straddle said work-support, with the comm-on plane of said platforms inclined from the horizontal, a bridge member securing said platforms together and providing a portion extending horizontally above said work-support, an endless saw-band extending around the edge of said frame and supported by wheels mounted in said platforms, an electric motor carried by said frame for driving said saw-band, and arms extending downwardly from the horizontal portion of said bridge member for guiding said sawband in a vertical plane.

JOSEPH L. ASHWORTH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,072,200 Wright Sept. 2, 1913 1,089,192 Erquhart et al Mar. 3, 1914 1,576,051 Jull Mar. 9, 1926 1,726,893 Grigsby Sept.'3, 1929 1,938,200 7 Wells Dec. 5, 1933 FOREIGN PATENTS Number Country Date 89,985 Switzerland Nov. 16, 1921 188,963 Great Britain of 1922 

